Mini Hearth, Bifurcated (Brown 208) Immediate Shipping Formicaria I would recommend a medium

I would recommend a medium sized nest for them because the chambers and tunnels for the Pioneer are larger on average than  some of our other nests

Vermiculite is sterile

White Sand Interior/ Brown Exterior

Please allow additional time if you create your own Mini Hearth with options

***This is the "Lair" design

Mini Hearth, Bifurcated (Brown 208) Immediate Shipping Formicaria I would recommend a mediumReady for Immediate Shipping, this Mini Hearth comes as shown in the photo accompanying this product. ****Bifurcated Mini Hearth 2 levels This is optimal for tiny and small ants, SOME medium ants as well. Not recommended for larger ant species**** (+$14) This is a large area for a colony of tiny or small ants. The extra level will be appreciated in terms of living space for a growing, small colony. Features: Color and Decor are as seen in accompanying